5、Audio Trouble（No sound)
No Sound
Check if have audio signal
input
N
Y
Y
N
Check the set of volume, Mute is normal
Check signal output on pin no. 4 & 6 of U13
Check power supply (>11V)on pin no. 7 of
U13/1517P
Y
N
Check the voltage (>9.2V) on pin no.8
Of U13
N
Y
YN
Check the signal output on pin 64 &65 of U12
YN
Does it has signal input on U12
Check the circuit from U12 to U13
Audio equipment
Repair the U13 power supply
Rest it
Check external
speaker
Does Q26 has damage
And repair D60 or R257
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